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                            <div style="color:gray; word-break: break-all; font-size:12px;">原英文版地址: <a href="https://www.elastic.co/guide/en/elasticsearch/reference/7.7/search-aggregations-bucket-global-aggregation.html" rel="nofollow" target="_blank">https://www.elastic.co/guide/en/elasticsearch/reference/7.7/search-aggregations-bucket-global-aggregation.html</a>, 原文档版权归 www.elastic.co 所有<br/>本地英文版地址: <a href="../en/search-aggregations-bucket-global-aggregation.html" rel="nofollow" target="_blank">../en/search-aggregations-bucket-global-aggregation.html</a></div>
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<span class="breadcrumb-node">global 聚合</span>
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<h2 class="title">
<a id="search-aggregations-bucket-global-aggregation"></a>global 聚合
</h2>
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<p>
定义一个搜索执行上下文中所有文档的单桶聚合。

这个上下文由索引和正在搜索的文档的类型定义，但<span class="strong strong"><strong>不</strong></span>受搜索查询本身的影响。
</p>
<div class="note admon">
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<p>global 聚合器只能作为顶级聚合器，因为将一个 global 聚合器嵌入另一个桶聚合器是没有意义的。</p>
</div>
</div>
<p>示例：</p>
<div class="pre_wrapper lang-console">
<pre class="programlisting prettyprint lang-console">POST /sales/_search?size=0
{
    "query" : {
        "match" : { "type" : "t-shirt" }
    },
    "aggs" : {
        "all_products" : {
            "global" : {}, <a id="CO228-1"></a><i class="conum" data-value="1"></i>
            "aggs" : { <a id="CO228-2"></a><i class="conum" data-value="2"></i>
                "avg_price" : { "avg" : { "field" : "price" } }
            }
        },
        "t_shirts": { "avg" : { "field" : "price" } }
    }
}</pre>
</div>
<div class="console_widget" data-snippet="snippets/475.console"></div>
<div class="calloutlist">
<table border="0" summary="Callout list">
<tr>
<td align="left" valign="top" width="5%">
<p><a href="#CO228-1"><i class="conum" data-value="1"></i></a></p>
</td>
<td align="left" valign="top">
<p><code class="literal">global</code>聚合的主体为空</p>
</td>
</tr>
<tr>
<td align="left" valign="top" width="5%">
<p><a href="#CO228-2"><i class="conum" data-value="2"></i></a></p>
</td>
<td align="left" valign="top">
<p>为此<code class="literal">global</code>聚合注册的子聚合</p>
</td>
</tr>
</table>
</div>
<p>上面的聚合演示了如何计算搜索上下文中所有文档的聚合(在本例中为<code class="literal">avg_price</code>)，而不管查询是什么(在本例中，它将计算目录中所有产品的平均价格，而不仅仅是“t_shirts”)。</p>
<p>上面的聚合的响应是：</p>
<div class="pre_wrapper lang-console-result">
<pre class="programlisting prettyprint lang-console-result">{
    ...
    "aggregations" : {
        "all_products" : {
            "doc_count" : 7, <a id="CO229-1"></a><i class="conum" data-value="1"></i>
            "avg_price" : {
                "value" : 140.71428571428572 <a id="CO229-2"></a><i class="conum" data-value="2"></i>
            }
        },
        "t_shirts": {
            "value" : 128.33333333333334 <a id="CO229-3"></a><i class="conum" data-value="3"></i>
        }
    }
}</pre>
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<div class="calloutlist">
<table border="0" summary="Callout list">
<tr>
<td align="left" valign="top" width="5%">
<p><a href="#CO229-1"><i class="conum" data-value="1"></i></a></p>
</td>
<td align="left" valign="top">
<p>聚合的文档数量(在这个例子中，是搜索上下文中的所有文档)</p>
</td>
</tr>
<tr>
<td align="left" valign="top" width="5%">
<p><a href="#CO229-2"><i class="conum" data-value="2"></i></a></p>
</td>
<td align="left" valign="top">
<p>索引所有产品的平均价格</p>
</td>
</tr>
<tr>
<td align="left" valign="top" width="5%">
<p><a href="#CO229-3"><i class="conum" data-value="3"></i></a></p>
</td>
<td align="left" valign="top">
<p>所有 t-shirts 的平均价格</p>
</td>
</tr>
</table>
</div>
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